Cointegration and Purchasing Power Parity in Exchange Rate Dynamics
Summary
Cointegration examines whether exchange rates and price levels move together over time, reflecting a stable long-run relationship even when individual series exhibit persistent shocks. Purchasing Power Parity (PPP) posits that exchange rates adjust so that an identical basket of goods costs the same across countries when valued in a common currency. In practice, short-term deviations from PPP arise due to factors such as transaction costs, market segmentation and monetary interventions, demanding robust econometric techniques to detect equilibrium tendencies.
Methodological advances have extended traditional linear cointegration tests by incorporating fractional integration, threshold and regime-switching models to capture long-memory behaviour and asymmetric adjustment processes. Vector error correction frameworks link transient fluctuations to underlying PPP equilibria, enabling researchers to quantify the speed at which real exchange rates revert after shocks. Empirical applications span both advanced and emerging economies, underlining the role of cointegration and PPP in guiding central bank policy, informing risk management strategies and facilitating international trade negotiations.
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Cointegration and Purchasing Power Parity in Exchange Rate Dynamics publication trend
The graph below shows the total number of articles in cointegration and purchasing power parity in exchange rate dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Cointegration: A statistical property of non-stationary time series indicating a stable long-run equilibrium relationship despite short-term deviations.
Purchasing Power Parity (PPP): A theory asserting that exchange rates adjust so that identical goods have equal value across countries when priced in the same currency.
Error Correction Model (ECM): An econometric framework linking short-term dynamics to long-term equilibria, allowing departures from a cointegrating relationship to drive subsequent adjustments.
Fractional Integration: A technique allowing time series to have non-integer orders of integration, capturing persistent long-memory effects.
Nonlinear Adjustment: Modelling approach in which the speed or path of convergence to equilibrium varies with the size or sign of the deviation.
References
- Testing absolute purchasing power parity in West Africa using fractional cointegration panel approach. Scientific African (2023).
- Exchange Rate Regimes in India: Central Bank Interventions and Purchasing Power Parity in the Context of ASEAN Currencies. Economies (2024).
- Nonlinear Cointegration and Asymmetric Adjustment in Purchasing Power Parity of the USA, Germany, and Pakistan. Complexity (2021).
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